FULL PRODUCT VERSION :
java version "1.8.0_31"
Java(TM) SE Runtime Environment (build 1.8.0_31-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.31-b07, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
13.4.0 Darwin Kernel Version 13.4.0: Sun Aug 17 19:50:11 PDT 2014; root:xnu-2422.115.4~1/RELEASE_X86_64 x86_64

A DESCRIPTION OF THE PROBLEM :
Consider this simple test program:

  import java.lang.annotation.*;
  import java.lang.reflect.*;
  
  public class AnnotationBug {
  
      @Retention(RetentionPolicy.RUNTIME)
      @interface MyAnnotation {
      }
  
      @MyAnnotation
      public static void main(String[] args) throws Exception {
          Method main = AnnotationBug.class.getMethod("main", String[].class);
          MyAnnotation annotation = main.getAnnotation(MyAnnotation.class);
          InvocationHandler handler = Proxy.getInvocationHandler(annotation);
          assert handler.equals(annotation) == false: "1";
          assert annotation.equals(handler) == false: "2";
      }
  }

This run with '-ea' option:

  Exception in thread "main" java.lang.AssertionError: 2
          at AnnotationBug.main(AnnotationBug.java:16)
  vimshell: exit 1 "java -ea AnnotationBug"

The cause is the following code.
http://hg.openjdk.java.net/jdk8u/jdk8u/jdk/file/c46daef6edb5/src/share/classes/sun/reflect/annotation/AnnotationInvocationHandler.java#l191

The code in URL, == operator applied to 'this' instance, but it should apply to proxy that is argument in 'invoke' method.


REPRODUCIBILITY :
This bug can be reproduced always.